Shiggins92
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 posted on 10/7/17 at 08:34 PM |
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Fuel Sender and Gauge
I have just bought an mk indy and it didnt have a fuel gauge but has the wiring etc for it.
The fuel gauge I have bought is a VDO fuel gauge and the range is 3-180ohms I couldn't get it working but I have measured the fuel sender float
arm and it ranges between 20-400ohms so obviously I am going to have problems.
I set the arm to around 100 ohms and also measured it the same at the output on the wiring to the gauge but when I wire the gauge in it does not read
even thought it is a 3-180hms gauge?
I plug in an old gauge with an unknown range and it goes to the maximum level even when putting the float arm to its maximum and minimum it still
stays the same.
So theres the brand new gauge saying 0. Theres an old gauge saying full and a fuel sender that has a massive range.
any ideas? 
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02GF74
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| posted on 10/7/17 at 08:51 PM |
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Please update your profile with your location.
This is an example of a seemingly simple elecritical problem that is best investigated/diagnosed in person by a knowledgeable person.
Else it a lot of guesswork and assumptions.
PS im in sw herts if that is close to you.
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Huttojb
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| posted on 11/7/17 at 08:42 AM |
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I've had this with my car.
I measure the voltage drop across my fuel Sender using ADC and then drive a transistor with the resistor range to control the Gauge
There maybe anologe ways using op-amps but I'm more digital and I used a PIC.
Jason
 
huttojb_GenTiger
There are only 10 types of people in the world. Those that understand binary and those that don’t.
If only DEAD people understand hexadecimal - 57,005
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Shiggins92
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| posted on 12/7/17 at 12:02 PM |
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quote:
Originally posted by Huttojb
I've had this with my car.
I measure the voltage drop across my fuel Sender using ADC and then drive a transistor with the resistor range to control the Gauge
There maybe anologe ways using op-amps but I'm more digital and I used a PIC.
Cheers thankyou I measured the voltage drop using ADC and managed to modify the sender to suit the gauge.
It works but it's not 100% accurate so I would like a sender to match can anyone recommend any to match the 3-180ohm vdo gauge of not I'll
send it back and get both to suit.
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